Locomotive-boiler.



J. M. IVIQCLE L'LON;

L OG'OMOTIVREOILER. APPLICATION FILED JUNE 20, 1007.

Patented Jan. 13; 1914 6 BHEBTEPSHBBT 1.

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J. M. MQGLELLON.

LOGOMOTIVE BOILER.

APPLIOATION FILED JUNE 20, 1907.

1 4,555. I Patented Jan. 13; 1914.

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-J. M. MQGLELLON.

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Patented J an. 13, 1914.

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J. M. MQCLELLON. LOGOMOTIVE BOILER.

APPLICATION FILED JUNE 20, 1907.

Patented Jan 13, 1914.

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J. M; MaOLELLON.

LOOOMOTIVE BOILER.

APPLICATION FILED JUNE 20, 1907.

JAMES M. MGCLELLON, OF EVERETT, MASSACHUSETTS.

LOCOMOTIVE-BOILER Specification of Letters Patent.

Application filed June 20, 1907.

Patented Jan. 13,1914.

Serial No. 379,837.

To all whom it or cry concern Be it known that I, James M. McCLnLLoN, acitizen of the United States, residing in Everett, county of Middlesex.and State of lllassachusetts, have invented an Improvement inLocomotive-Boilcrs,of which the following description, in connectionwith the accompanying drawing, is a specification, like letters on thedrawing representing like parts. i

This invention relates to boilers of the locon'iotive type andespecially to the firebox thereof.

The objectof the invention is to provide a novel form of fire-box havingwater-tubes located within it for increasing the heating surface, whichwater-tubes are arranged in such a way that they batlle the hot. gasesand operate to retain the hot gases in the firebox somewhat longer thanis possible with other arrangements of water-tubes now c0rnmonly knownor previously patented.

In the present invention the water-tubes extend diagonally across thecombustionchamber of the fire-box from the lower back corner to theupper front corner, and thus stand substantially at right angles to thepath of the hot gases. In this way the water-tubes act to batlle thegases and retain them longer in the firebox so that the full benefit ofthe heat generated may be obtained.

Referring to the drawings wherein I have shown some embodiments of myinvention, Figure 1 is a longitudinal section ofa locomotive boilershowing, my improvements applicdthereto; Fig. 2 is a similar viewshowing a modified form of my invention; Fig. 3 is a similar viewshowing another modification of my invention; Fig. 4 is an enlargedsection on the line w---."c, Fig. 1; Fig. 5 is a section onthe line z-'3 Fig. 1; Fig. (i is a sectional View showing still anothermodification.

3 is the shell or barrel of the boiler within which are the usual flues4: that extend from the combustion chamber 5 of the tire-box to thesmoke chamber (3. Said fines are sustained at one end in the fine-sheet7 which forms one end of the chamber 6 and the other end in theflue-sheet 8 which forms the back wall of the coml'iustion chamber.These parts may be such as are commonly found in locomotive boilers andform no part of my present invention.

My improved fire box has a drum or water and steam chamber 9 at theupper front end side to side of the fire-box and into which the upperends of the water tubes 11 are expanded. This drum has secured theretothe upper edges of the front sheet-s 23 and 24 which form between themthe usual water leg at the front or door end of the firebox. Said waterleg communicates with the inteiior of the drum through apertures 18 inthe .att'er. r

In Figs. 1 and 2 the top of the fire-box is formed by a crown sheet 13which is secured at its front edge to the drum 9 and at its rear edge tothe flue sheet 8, said flue sheet being substantially rectangular inoutline, as shown best in Fig. 5, and extending at the vcorners beyondthe circular contour of the shell 3. V

In Figs. 1 and 3, 12 is an outer sheet which forms with the crown sheet13 a steam space let, which outer sheet is riveted at its front edge tothe drum 9 and at its rear edge either directly to the shell 3 or to :1.connecting sheet 14 which'in turn is riveted to said shell. Where aconnecting sheet 14 is used it is substantially rectangular in shape andis provided with the flanged aperture into which the end of the shell isreceived and to which. it is riveted, as shown in Fig. 1.

A water leg, is formed at each side of the fire-box by the inner andouter sheets 20 and 21. The outer sheet 21 may be integral with theouter sheet 12 at the top of the fire-box I have herein shown thechamber 9 I or may be a separate sheet secured thereto at its upperedge, and the inner sheet 20 may be integral with the crown sheet 13 ormay be a separate sheet having its upper edge secured to the edges ofthe crown sheet as desired. Both the sheets 20 and 21 at the sides ofthe firebox are cut to fit the drum 9, and are riveted thereto as seenin Fig- The drum 9 communicates with the space between the sheets and 21at each side of the fire-box through suitable apertures 16 formed in thedrum,

It will be noted that the chamber formed by the drum 0 is separate anddistinct from the other water spaces of the boiler, although saidchamber communicates with said other water spaces.

The water chamber 10 may be in the form of a drum but is preferably madeby extending the flue sheet 8 below the shell 3 and bending the same toform one side of said water space. The other side of the water space maybe formed by extending both the due sheet 8 and the connecting 1 1 beiowthe shell 3 and bending them both to form the sides of the chamber. Thelower edges of the sheets 8 and 1t preferably extend below the chamberto form the water leg 25, said sheetsbuth being secured to the usualfilling ring .28. The sheets 8 and 14 may be connected at either side ofthe chamber 12 by suitable stay pieces 26 which are provided withperforations 27 to permit free communication between the chamber 10 andboth the shell 3 and the water leg 25.

In Fig. 2 the crown sheet is omitted, and in lieu thereof I have shownclosely arranged water tubes 130 which are connected at one end to thedrum E) and at the other end are expanded into the flue sheet 8. Thesewater-tubes, being closely arranged, serve a crown sheet, and they arecovered by a sheet 12- si'milar to that shown in Figs. 1 and 3, which issecured at one end to the front edge of the drum 9 and at the rear edgeto the connecting ring or sheet 14:-

The ends of the drum 9 are preferably bumped so as to avoid thenecessity of staying and'are provided with manholes closed by suitablecovers 29 so to afford entrance to the drum for expanding the watertubes 11 thereinto. The drum 9 is placed at substantially the level ofthe top of the shell, as will be plainly seen from Figs. 1 and 2, andthe steam space 44: which connects the drum with the shell is above thenormal water level so'that said space will be filled entirely withsteam, and as stated above the chamber formed by the drum 9 is notmerely an extension of the other water spaces of the boiler but is aseparate independent chamber, al-' though it communicates with the otherWater spaces of the boiler. The outer sheets 21 are also provided withmanholes opposite the chamber 10 which manholes are closed by suitablecovers 29, said manholes providing suitable access to the chamber 10 forexpanding the lower ends of the water tubes 11 into the sheet 8 or forcutting said water tubes therefrom.

The sheets at the side of the fire-box are stayed in the usual way, andfor staying the portion of the, sheets opposite the chamber 10 I proposeto employ a stay rod 31 which extends clear through the chamber and issecured at its ends to the heads or covers 529. The sheets 20 and 21 atthe sides of the firebox 39 leading to the fire-box, and these doors areclosed suitable closures 40. These doors provide access to the chamberof the fire-box back of the water-tubes 11 for the ur )OSG of ex andinthe fines at into the flue i z:

sheet 8 or for other repair work.

The water-tubes 11 extend clear across the fire-box from one side to theother thereof and thus act to completely baflle the hot gases on theirway to the tines 4 and serve to hold the hot gases in the fire-box for alonger period than is possible with the ordinary construction.Furthermore, said watertubes provide a greatly increased heating surfacein the fire-box and thus greatly increase the steaming capacity of theboiler.

This type of fire-box permits the use of a wide grate, and by arrangingthe fire-box as shown in Figs. 1, 2 and 3 the rear edge thereof nay beplaced between two of the drivers thus permitting the fire-box to be setcomparatively low upon the wheels.

In connection with the features thus far described I have showndifferent ways of superheating the steam generated in the fire-box.

In Fig. 1 I have shown if plurality of super-heating pipes 42 which aresituated in the combustion chamber above. and back of the water-tubesl1. Said superheating pipes are connected at one end to a header orchamber 43 which in turn communicates with the steam space 44 above thecrown sheet through suitable nipples or nipple a5, and atthe other endsaid superheating pipes are connected to another chamber or header 46 towhich is connected a pipe 47 leading through the shell of the boiler andto the engine cylinders. lVith this construction the steam generatedspace above the crown sheet will pass through the superheating pipes 42to the delivery pipe 47' and from the latter to the engine cylinders.The presence of the water-tubes 11 andsuperheating pipes 42 will preventthe crown sheet, 13 from burning out even though it is not covered withwater. To prevent the superheated steam from becoming cooled during itstransit through the shell 3 I propose to inclose the pipe 47 in a protee-tor pipe or large flue 48 which will prevent the water in the shellfrom coming directly in contact with the pipe 47. This large flue 4-8preferably communicates at one end with the combustion chamber 5 and atthe other end with the smoke chamber 6 so that at the other end theproducts of combustion may pass'through the flue around the pipe 47.

In Fig. 3 the superheating pipes are desigare also provided with doorsor openings and accumulated in the A shell 3.

In the embodiment shown in Fig. 1 an extra door or opening 4:0 isprovided in the side of the firebox above the superheating pipes t-2,said door forming means of getting into the combustion chamber abovesaid superheating tubes for the purpose of expandingf the latter intothe headers 48 and 46.

In Fig. 6 I have shown another modification of the invention wherein thechamber at the lower end of the water-tubes 11 is made of less diameteror size than shown in Figs.

' other respects however the invention shown in Fig. 6 is similar tothat shown in the other figures of the drawing.

l-laving fully described my invention what I claim as new and desire tosecure by Letters Patent is:

1. In a boiler of the locomotive type, the combination with a barrel orshell, of a tire box having water spaces in its sides and front, acylindrical drum separate from the fire box and extending transverselythereof at the top of the door endthereof, said drum having openingsthrough its side which communicate with said water spaces, and otheropenings which communicate with the :lront water space of the fire box,a lower water chamber also extending transversely of the fire box at theopposite end thereof, and

water tubes connecting said chamber and drum.

2. In a boiler of the locomotive type, the combination with a barrel orshell, of a firebox having, its sides formedfrom two straight parallelsheets separated to form a water space, a cylindrical drum separate fromsaid sheetsfand extending transversely of the lire box at the top of thedoor end thereof, the sheets forming the sides of the fire box beingsecured to the drum, and said drum having openings in its sidescommunicating with said water space, a water chamber extendingtransversely of the fire box at the opposite end'thereof, and watertubes connecting said chamber and said drum.

3. In a locomotive boiler, the combination with a barrel or shell, of afire box having its sides formed of two sheets separated to form a waterspace, a drum extending transvcrsely of the fire box at the top of thedoor side thereof, said drum having" continuous sides and closed endsand being separate from said sheets but'being secured thereto, twoseparate sheets extending across the top of the fire box and alsosecured to said drum, the space between. said sheets communicating withthe interior of the barrel or shell, and said drum having openings inits sides communicating with said space and also with the water spacesat the sides of the tire box. 1

t. In a boiler of the locomotive type, the combination with a barrel orshell, of a firebox having a drum extending transversely thereof at thefront, and a lower chamber also extending transversely thereof at therear, water-tubes connecting said drum and chamber, and means within thefire-box above said water-tubes for super-heating the steam.

5. In a boiler oi the locomotive type, the combinatimi with a barrel orshell, of a firebox at one end thereof, said firebox having avtraiisvcrsely-exteuding drum at the top of the door end thereof, watertubes leading intn said drum and extending diagonally acros s helire-box, and superbeating, tubes situated Within'lihe firebox above thewater tubes. I

In testimony whereof, I have signed my name to this specification, inthe presence of 100 .two subscribing witnesses.

JAMES M MoUlillLLON.

Witnesses: 7

Louis C. SMITH, lvlluwaiurr A. DUN N.

